Lexus ES300 (1997 year). Manual — part 308

P00495

Outside

Inside

DI–8

–

DIAGNOSTICS

ENGINE

160

1997 LEXUS ES300 (RM511U)

3

Does engine start ?

NO

Go to step 7.

YES

4

Check air filter.

PREPARATION:
Remove the air filter.
CHECK:
Visual check that the air filter is not dirty or excessive oily.
HINT:If necessary, clean the filter with compressed air. First
blow from inside thoroughly, then blow from outside of filter.

NG

Repair or replace.

OK

5

Check engine idle speed.

PREPARATION:
(a)

Warm up engine to normal operating temperature.

(b)

Switch off all accessories.

(c)

Switch off air conditioning.

(d)

Shift transmission into ”N” position.

(e)

Connect the OBD II scan tool or LEXUS hand–held tester to DLC3 on the vehicle.

CHECK:
Use CURRENT DATA to check the idle speed.
OK:

Idle speed: 650

∼

750 rpm

NG

Proceed to problem symptoms table on
page

DI–22

.

OK

A00209

DLC1

TE1

E1

SST

DLC1

P12915
P12952

P20186

–

DIAGNOSTICS

ENGINE

DI–9

161

1997 LEXUS ES300 (RM511U)

6

Check ignition timing.

PREPARATION:
(a)

Warm up engine to normal operating temperature.

(b)

Switch off all accessories.

(c)

Switch off air conditioning.

(d)

Shift transmission into ”N” position.

(e)

Keep the engine speed at idle.

(f)

Using SST, connect terminals TE1 and E1 of the DLC1.
SST

09843 – 18020

(g)

Using a timing light, connect the tester to check wire.

CHECK:
Check ignition timing.
OK:

Ignition timing: 10

° BTDC at idle

NG

Proceed to page

IG–1

and continue to

troubleshoot.

OK

Proceed to problem symptoms table on page

DI–22

.

7

Check fuel pressure.

PREPARATION:
(a)

Be sure that enough fuel is in the tank.

(b)

Connect the LEXUS hand–held tester to the DLC3.

(c)

Turn ignition switch ON and push LEXUS hand–held tes-
ter main switch ON.

(d)

Use ACTIVE TEST mode to operate the fuel pump.

(e)

If you have no LEXUS hand–held tester, connect the pos-
itive (+) and negative (–) leads from the battery to the fuel
pump connector (See page

SF–6

).

CHECK:
Check that the pulsation damper screw rises up when the fuel
pump operates.

NG

Proceed to page

SF–6

and continue to

troubleshoot.

OK

P23917

DI–10

–

DIAGNOSTICS

ENGINE

162

1997 LEXUS ES300 (RM511U)

8

Check for spark.

PREPARATION:
(a)

Remove the ignition coil or disconnect the high–tension
cord from spark plug.

(b)

Remove the spark plug.

(c)

Install the spark plug to the ignition coil or high–tension
cord.

(d)

Disconnect the injector connector.

(e)

Hold the end about 12.5 mm (0.5 in.) from the ground.

CHECK:
Check if spark occurs while engine is being cranked.
NOTICE:To prevent excess fuel being injected from the in-
jectors during this test, don’t crank the engine for more
than 5

∼

10 seconds at a time.

OK:

Spark jumps across electrode gap.

NG

Proceed to page

IG–1

and continue to

troubleshoot.

OK

Proceed to problem symptoms table on page

DI–22

.

–

DIAGNOSTICS

ENGINE

DI–11

163

1997 LEXUS ES300 (RM511U)

7.

ENGINE OPERATING CONDITION

NOTICE:The values given below for ”Normal Condition” are representative values, so a vehicle may
still be normal even if its value from those listed here. So do not decide whether a part is faulty or
not solely according to the ”Normal Condition” here.
(a)

CARB mandated signals.

LEXUS hand–held tester display

Measurement Item

Normal Condition*

FUEL SYS #1

Fuel System Bank 1

OPEN: Air–fuel ratio feedback stopped

CLOSED: Air–fuel ratio feedback operating

Idling after warming up: CLOSED

FUEL SYS #2

Fuel System Bank 2

OPEN: Air–fuel ratio feedback stopped

CLOSED: Air–fuel ratio feedback operating

Idling after warming up: CLOSED

CALC LOAD

Calculator Load:

Current intake air volume as a proportion of max.

intake air volume

Idling: 13.1

∼

18.7%

Racing without load (2,500rpm): 11.7

∼

17.3%

COOLANT TEMP.

Engine Coolant Temp. Sensor Value

After warming up: 80

∼

95

°

C (176

∼

203

°F)

SHORT FT #1

Short–term Fuel Trim Bank 1

0

±

20%

LONG FT #1

Long–term Fuel Trim Bank 1

0

±

20%

SHORT FT #2

Short–term Fuel Trim Bank 2

0

±

20%

LONG FT #2

Long–term Fuel Trim Bank 2

0

±

20%

ENGINE SPD

Engine Speed

Idling: 650

∼

750

rpm

VEHICLE SPD

Vehicle Speed

Vehicle stopped: 0 km/h (0 mph)

IGN ADVANCE

Ignition Advance:

Ignition Timing of Cylinder No. 1

Idling: BTDC 10

∼

25.0

°

INTAKE AIR

Intake Air Temp. Sensor Value

Equivalent to Ambient Temp.

MAF

Air Flow Rate Through Mass Air Flow Meter

Idling: 3.3

∼

4.7

gm/sec.

Racing without load (2,500 rpm):

10.4

∼

15.4 gm/sec.

THROTTLE POS

Voltage Output of Throttle Position Sensor

Calculated as a percentage:

0 V

→

0%, 5 V

→

100%

Throttle valve fully closed: 7

∼

11%

Throttle valve fully open: 65

∼

75%

O2S B1, S1

Voltage Output of Oxygen Sensor

Bank 1, Sensor 1

Idling: 0.1

∼

0.9

V

O2FT B1, S1

Oxygen Sensor Fuel Trim Bank 1, Sensor 1

(Same as SHORT FT #1)

0

±

20%

O2S B1, S2

Voltage Output of Oxygen Sensor

Bank 1, Sensor 2

Driving 50 km/h (31 mph): 0.1

∼

0.9

V

O2S B2, S1

Voltage Output of Oxygen Sensor

Bank 2, Sensor 1

Idling: 0.1

∼

0.9

V

O2FT B2, S1

Oxygen Sensor Fuel Trim Bank 2, Sensor 1

(Same as SHORT FT #2)

0

±

20%

∗

: If no conditions are specifically stated for ”ldling”, it means the shift lever is at N or P position, the A/C switch

is OFF and all accessory switches are OFF.